# -3 Type.

**Citation:** 49 CFR 179.220-3  
**Type / status:** regulation / current  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** 2026-08-18  
**Published:** Not stated

(a) Tanks built under these specifications must consist of an inner container, a support system for the inner container, and an outer shell.

(b) The inner container must be a fusion welded tank of circular cross section with formed heads designed convex outward and must have a manway on top of the 

## Document text

(a) Tanks built under these specifications must consist of an inner container, a support system for the inner container, and an outer shell.

(b) The inner container must be a fusion welded tank of circular cross section with formed heads designed convex outward and must have a manway on top of the tank as prescribed herein. When the inner container is divided into compartments, each compartment must be considered a separate container.

(c) The outer shell must be a fusion welded tank with formed heads designed convex outward.

[Amdt. 179-9, 36 FR 21340, Nov. 6, 1971]

## Provenance

- Official: Yes
- Source: <https://www.ecfr.gov/on/2026-08-18/title-49/section-179.220-3>
- Source ID: `ecfr`
- SHA-256: `6186e081b96354508ae7fe4abfd4fa52f0a6d081615262b2fd133c361856f873`
- Retrieved: 2026-08-20T05:46:20.606Z
- Exported: 2026-08-24T04:07:26.645Z
- Document slug: `49-cfr-179-220-3`

### Source metadata

```json
{
  "cfrTitle": 49,
  "part": "179",
  "section": "179.220-3",
  "subpart": "Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW)",
  "corpusVersion": "2026-08-18",
  "jurisdiction": "US"
}
```